München 2009 – scientific programme
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T: Fachverband Teilchenphysik
T 31: Elektroschwache Wechselwirkung 1
T 31.1: Group Report
Monday, March 9, 2009, 17:00–17:20, A017
Latest Results with the Neutron Decay Spectrometer aSPECT — •Gertrud Konrad1, Fidel Ayala Guardia1, Stefan Baessler2, Michael Borg1, Ferenc Glück3, Werner Heil1, Igor Konorov4, Kent Leung5, Raquel Muñoz Horta1, Martin Simson4,5, Yury Sobolev1, Torsten Soldner5, Hans-Friedrich Wirth6, and Oliver Zimmer4,5 — 1Institut für Physik, Universität Mainz — 2University of Virginia, Charlottesville, VA, USA — 3IEKP, Universität Karlsruhe (TH) — 4Physik-Department E18, TU München — 5Institut Laue-Langevin, Grenoble, France — 6Fakultät für Physik, LMU München
The purpose of the retardation spectrometer aSPECT is to determine the antineutrino electron angular correlation coefficient a with high precision, by measuring the integral proton spectrum in free neutron decay. With a precise measurement of the correlation coefficient a tests of the validity of the Standard Model become possible. Of great interest are here the search for scalar and tensor interactions, and to test the unitarity of the CKM matrix.
In a beam time performed during April/ May 2008 at the neutron research reactor ILL in Grenoble/ France we reached a statistical accuracy of about 2 % per 24 hours measurement time. From the investigated systematic effects and the collected statistics, we expect a total relative error well below the present literature value of 5 %.
The physical motivation and the design and optimization of the spectrometer as well as the status and first results of the data analysis will be presented in this talk.